battle cry

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

ˈbattle cry BrE AmE noun [countable usually singular]
1. a phrase used to encourage people, especially members of a political organization:
‘Socialism Now!’ was their battle cry.
2. a loud shout used in war to encourage your side and frighten the enemy